Hey fellas, pardon my ignorance, but what do the vacuum lines do on the OEM exhaust? Do they somehow control the exhaust valves in the cans?

I'm looking for a way to keep the valves open all the time for a bit more sound and would love to be able to do this via coding if possible or some other 15 minute job that doesn't require me to cut open the cans.

Vacuum lines open the actuators on the exhaust. Once the cats are warmed up, the valves open. I am not 100% sure if they close again, but I am pretty sure they don't, and I am very certain they are always open when in M-mode.

If you want the valves opened all the time, no questions, you could pinch or plug the lines and force the valve open mechanically. Not sure that it will buy you much.